A new approach to thermally stable elastomers for use between temperatures of 180°C and 275°C has been developed. Wholly aromatic poly(aryl ether ketone)s of various molecular weights have been synthesized with maleimide end groups. These structures have glass transition temperatures (Tzs) in the 150°C range, and when thermally crosslinked, they exhibited elastomeric characteristics ~30-50°C above their Tss (~200°C). The moduli of the networks at 200°C were comparable to those of unreinforced poly (dimethylsiloxane) elastomers ( 1-2 MPa) and the elongations ranged from 200 to 300%. The poly.(aryl ether ketone) elastomers showed exceptional thermal stability with little weight loss up to 490°C. The results from the chemorheology and stress relaxation measurements are discussed and compared to poly (dimethylsiloxane) networks.
Посилання на статтю:
Elastomeric behaviour of crosslinked poly(aryl ether ketone)s at elevated temperatures / J. L. Hedrick*, A. C.-M. Yang and d. C. Scott and J. E. Economy // Polymer. – 1992. – Vol 33. – P. 5094-5097.